@sferrell615, 5/22/16 10:22 am. Thank you for noting the new version (18) of the driver and mftoolbox that is available on their site. I downloaded the two files and followed the steps you suggested. I will add that before removing and installing the new driver, I unplugged the USB cable until the new driver installation said to plug it in, which is an old standard method. The mftoolbox seems to work fine on all settings and even using the feeder. I then used Windows Fax and Scan to make a scan, which also worked fine (although not very many settings and you can't scan as a pdf file), then reopened mftoolbox and it also ran perfectly again. With the old version, that sequence would cause the scanner error message, but not now.
I am using Windows 10 with all the latest updates.
I had been using version 17 and whenever it locked me out, I would just open task manager, scroll down to "Service Host: Windows Image Acquisition (WIA)", click on it, then end the task (after agreeing to abandon all data). I then just restarted mftoolbox and it would run fine until something made it lock up (only occurred maybe once a month). This took maybe 15 seconds and was a satisfactory work around solution.
So we will see if this new version, which implied it was for Windows 10, works any differently. The desktop icon was changed a little if I remember the old one correctly. I will let this forum know if I experience any new problems with this (your) solution. Thank you again!